Collapsible frame.



G. W. DUNN.

COLLAPS|BLE FRAME. APPLICATION FILED ocr. 26'. lays. RENEWED on. 4. m1.

1 72,023. Patented July 9, 1918.

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GEORGE W. DUNN, F NEWPORT, KENTUCKY.

COLLAPSIBLE FRAME.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed October 26, 1915, Serial No. 58,034. Renewed. October 4, 1917. Serial No. 194,805.

To all whom it may concern:

Be it known that I, GEORGE W. DUNN, residing in Newport, Campbell county, State of Kentucky, have invented certain new and useful Improvements in Collapsible Frames, of which the following is a clear, full, and eXact description, attention being called to the drawing which accompanies this application and forms a part thereof.

This invention relates to collapsible frames, supports, or trestles, and concerns improvements in the construction of such devices whereby the manipulation for their erection is greatly facilitated and which permits the reduction of these devices to a compact shape.

The invention consists of the particular construction as the same is hereinafter described and claimed and asit is illustrated in the accompanying drawing in which:

Fi 'ure 1. shows an end view of the frame or support in side elevation, fully extended, part of the erected table at one end thereof.

Fig. 2. is a side view of the same.

Fig. 3 is an end view of the device, partly folded.

Fig. 4. is another side view of this support and illustrates its manipulation advanced to the stage for closing it up.

Fig. 5. is a plan view, the support fully closed up.

Fig. 6. shows an edge View of the support fully closed up.

As shown herein my improved support or frame consists of a horizontal bar 12 which bar'at its ends is sustained by props, there being a pair of them for each end of the bar. The members of each pair when in the position shown in Fig. 1, are spaced apart at their lower ends and converge to ward their upper ends where they engage bar 12. The members 13, 13 of one pair which at their upper ends support one end of bar 12, are permanently connected to said bar by a pivot bolt 15. The upper ends of props 14, 14, which support bar 12 at its other end are adapted, when the trestle is erected for use, to occupy recesses 16, 16, one in each side of said bar, These props 14, 14 are connected to each other near their upper ends by a brace 17 non-rigidly attached thereto by pivot bolts 18, 18.

When the frame is in erected position, one pair of its props crosses the other pair as shown in Fig. 2, and the pairs are connected collapsing of brace 23 as shown in Fig. 0.

to each other where their props cross, a prop 13 of one'pair to a prop 14 of the other pair, on each side of the frame. Pivot bolts 19 are used for this connection so that the pairs of props may pivot on each other as shown in Fig. 4, and the device may be entirely closed up as shown in Fig. 6. In the erected position, bar 12 is prevented from slipping away from the upper ends of props 14, by means of a stop 21 which occupies a notch 22 in the underside of said bar. This stop is formed from a metal bar shaped, as shown, in form of an inverted U. The middle portion thereof constitutes the stop proper, its end portions being bent downwardly and connected to pivot bolts 18. Bar 12 is held down on this stop with the latterv in notch 22, by the clamping action of the upper ends of props 14. This effect is obtained by means of a brace 23 which consists of two sections connected to each other by an articulated joint and each of the sections non-rigidly connected to a prop 14 of the outer pair with a similar joint. When said brace sections are alined as shown in Fig. 1, they spread props 14 below brace 1'7 and cause their upper ends to approach each other and clamp bar 12, bolts 18 forming the pivotal turning point of the props. The wo brace sections are held in alinement by a stop 24 on one section adapted to drop into a notch 25 on the other section.

Closing up of the. frames is started with This releases bar 12 from the upper ends of props 14 and permits itsdisengagement from stop 21. It also permits movement of the pairs of props on each other and they are first moved downwardly as shown in Fig. 4, to permit the free end of bar 12 to pass below brace 17. Thereafter they are raised up again as shown in dotted lines-in Fig. 4, and entirely folded up so that all members lie in one plane as shown in Fig. 6 At the same time they are also closed up laterally as shown in Fig. 5. The trestle is erected by reversing the method of manipulating the device just described and also the order of the operations. It will be observed that brace 17 which connects outer props 14 to each other is of such a length as to permit this lateral closing up of the frames to be complete, that is to an actual contact between the members as shown in Fig. 5. The position of the brace 17 must also be such as to permit props 14 to assume the position shown in Fig. 1 and required when the frame is erected. 7

Obviously these frames may be used to serve as supports for any purpose.

Having described my invention I claim as new 1 Y A collapsible frame consisting of an outer pair of props, an inner pair of props within the outer pair, the props of one pair being permanently pivoted to the props of the other pair approximately midway between the ends of the props, a supporting bar permanently pivoted near one of its ends between the upper ends of the props of the inner pair and provided with a notch in its under side near its other end where it is adapted to occupy a position between the spaced upper ends of the props of the outer pair, a stop bar extending across this space adapted to be received by the notch mentioned and bent to extend downwardly on the outer props to which props below their upper ends it is non-rigidly connected at its ends by pivot bolts, a transverse brace also pivotally connected to said same props at each of its ends by these same bolts, and

a sectional brace non-rigidly connected to the props of one of the pairs below the brace first mentioned, whereby, when said sectional brace is adjusted to its bracing position, the outer props are caused to spread below their pivotal connections to the other brace which connections become fulcrums on which the props swing so as to cause the upper ends of said props above said brace to move against the sides of the supporting bar, thereby clamping the same and holding it by means of the engagement of the notch therein with the stop bar, the pivotal connection of this upper brace to the outer props being so spaced from the upper ends of these props as to produce the aforesaid clamping effect upon the supporting bar, the upper brace being of such a length that when the frame is collapsed, it permits the four props with the supporting bar between them to be compactly closed up against each other.

In testimony whereof I hereunto aifix my signature in the presence of two witnesses.

GEORGE WV. DUNN.

lVitnesses:

C. SPENGEL, A. JoHNsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

